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When I moved in Luxembourg, I subscribed to Tango Luxembourg Fiber internet access. Back then, I got the usual dynamic public IP address “for free”. It was changing every 36 hours but at least it was a public one. Recently, I changed my subscription to the 1 gigabit/s offer and soon after, I realized my VPNs and 6to4 tunnel was not working anymore. After a brief troubleshooting session, I found out I was receiving a private IP address instead of the usual public 94.252.x.x . ...

I recently installed an Ubuntu 21.04 and when I wanted to install Atom editor, I was given the following warning about apt-key being deprecated: Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)). After a bit of Googling around, I stumbled on this post on askubuntu.com explaining why apt-key was being deprecated. Then the folks at docker.com give a nice easy command to convert an old PGP key in base64 to a keyring. ...

After reading many articles and trying many things, this is how I solved it. For docker daemon itself to use a proxy, configure environment variables using systemd file /etc/systemd/system/docker.service.d/http-proxy.conf : [Service] Environment="HTTP_PROXY=http://user:pass@proxy.domain.com:3128/" Environment="HTTPS_PROXY=http://user:pass@proxy.domain.com:3128/" Environment="NO_PROXY=localhost,docker,*.domain.com" For gitlab-runner daemon itself to use a proxy, configure environment variables using systemd file /etc/systemd/system/gitlab-runner.service.d/http-proxy.conf : [Service] Environment="HTTP_PROXY=http://user:pass@proxy.domain.com:3128/" Environment="HTTPS_PROXY=http://user:pass@proxy.domain.com:3128/" Environment="NO_PROXY=localhost,docker,*.domain.com" Reload systemd and restart docker daemon: systemctl daemon-reload systemctl restart docker For git commands run by gitlab-runner to use a proxy, use gitlab-runner config file. In /etc/gitlab-runner/config.toml , under [[runners]] , add the following line: ...

It happens I recently had to install Gitlab and was a bit lost about what to do right after the setup finished, perhaps this will help. By default, Gitlab stores its data files in /var/opt/gitlab and its backups in /var/opt/gitlab/backups. It would be a good idea to use dedicated partitions for each of those directories. Let’s say you use /dev/sdb1 for Gitlab data and /dev/sdc1 for the backups. gitlab-ctl stop mkdir /mnt/gitlab mount /dev/sdb1 /mnt/gitlab mkdir /mnt/gitlab/backups mount /dev/sdc1 /mnt/gitlab/backups tar -C /var/opt -cf - gitlab | tar -C /mnt -xpsf - umount /mnt/gitlab/backups umount /mnt/gitlab mv /var/opt/gitlab /var/opt/gitlab.old mkdir /var/opt/gitlab mount /dev/sdb1 /var/opt/gitlab mount /dev/sdc1 /var/opt/gitlab/backups gitlab-ctl start Do not forget to edit /etc/fstab. Configure your timezone: https://docs.gitlab.com/ee/administration/timezone.html Note: all usual timezones are not available. ...

Here is how to establish an IPsec tunnel between an Ubuntu 20.04 host and a Mikrotik router using IKEv2. The 2 endpoints of the tunnel are: ubuntu.xentoo.info : the Ubuntu server. This server has a local private subnet 10.0.0.0/24 and a fixed public IPv4 address 1.2.3.4 . The hostname ubuntu.xentoo.info resolves to the public IP address. mikrotik.xentoo.info : the Mikrotik router. This router has a local private subnet 192.168.0.0/24 and a dynamic public IPv4 address. I will use fqdn identifiers, pre-shared-key and both IKE and ESP will have the same parameters: ...

“Firefly III” is a (self-hosted) manager for your personal finances. You can find more about it on the following sites: https://github.com/firefly-iii/firefly-iii https://docs.firefly-iii.org/ Install prerequisites Let’s first install the requirements to run Firefly. Firefly documentation says it runs on PHP 7.2 but that’s wrong, it needs >=7.3 . Unfortunately, Ubuntu 19.04 comes with PHP 7.2 by default, so we need to use a PPA to have a more recent version. ondrej/php PPA has version 7.4 at this time, that will be perfect. ...

Hi guys, I moved to Luxembourg and I have opted for Tango Fiber. Their router is a Fritz!box which I do not like at all. I have a spare Mikrotik router, so here is how to configure. Tango Fiber uses PPPoE over VLAN 35, MTU is 1480. You need to ask the PPP credentials via a contact form on the website, they will answer within a few days. I have decided to use ether1 to connect the Fiber and create a VLAN interface named ether1.35 on it. ...

As a personal note to myself :-) apt-get install make gcc pkg-config libasound2-dev wget http://www.pjsip.org/release/2.6/pjproject-2.6.tar.bz2 tar -xjf pjproject-2.6.tar.bz2 cd pjproject ./configure && make dep && make sudo make install sudo cp pjsip-apps/bin/pjsua-x86_64-unknown-linux-gnu /usr/local/bin/pjsua That’s it!

For easier use with Cacti, it is easier to group statistics per type instead of per CPU. So you would have a parent OID for CPU time spent by user with many values (one per CPU). Put the following in /etc/snmp/percpudetail: #!/bin/bash case "$1" in "user") grep ^cpu /proc/stat | awk '{print 2}' ;; "nice") grep ^cpu /proc/stat | awk '{print 3}' ;; "system") grep ^cpu /proc/stat | awk '{print 4}' ;; "idle") grep ^cpu /proc/stat | awk '{print 5}' ;; "iowait") grep ^cpu /proc/stat | awk '{print 6}' ;; "irq") grep ^cpu /proc/stat | awk '{print 7}' ;; "softirq") grep ^cpu /proc/stat | awk '{print 8}' ;; esac Make it executable: ...

I needed to export detailed CPU statistics from Linux servers using SNMP. While UCD-SNMP-MIB export some detailed stats, it only does it for the whole system. I may have missed something easier though :-) So here is a BASH script, put it in /etc/snmp/percpustats: #!/bin/bash /bin/grep "^$1 " /proc/stat | sed -e 's/^cpu[0-9]* *//' | tr ' ' '\n' Make it executable: chmod +x /etc/snmp/percpustats This simple script takes a single argument, which is the cpu id you want to look at. By “cpu id”, I mean the first word of cpu* lines in /proc/stat . So cpu, cpu0, cpu1, etc. Here is a sample content of my /proc/stat file: ...